井冈羟胺A的衍生及其生物活性研究
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摘要
井冈霉素是高效、安全和作用机制独特的无公害生物农药,其水解产物井冈羟胺A是已知天然海藻糖酶抑制剂中抑酶活性最高的化合物之一。本论文选取井冈羟胺A为先导化合物进行优化研究,设计合成了40个未见文献报道的新化合物,并对它们进行了杀虫、杀菌和除草等生物活性的测试。
     首先,对制备井冈羟胺A的方法进行了改进,以井冈霉素A为原料,改用碳酸钙为中和试剂,采用在中和液中直接结晶的方法,得到了纯度较好的井冈羟胺A盐酸盐,收率达到了50%。制备步骤简洁,分离简单。
     用二甲菊酰氯、二氯菊酰氯和功夫菊酰氯对井冈羟胺A的C-7’位上的羟基进行结构改造,合成了3个新的7’-O-菊酰基井冈羟胺A。对实验条件进行了优化。产物用水和乙酸乙酯两相分离,水相经两次柱层析,得到目标产物,收率为43.3~44.3%。
     采用活性二氧化锰对井冈羟胺A的C-7’位上的羟基进行选择性氧化,得到了7’-井冈羟胺A醛,反应采用超声波辐射催化,取得了较好的效果,收率达77.8%。
     用脂肪胺和芳胺对7’-井冈羟胺A醛的醛基进行修饰,合成7个新的7’-(N-取代亚胺基)井冈羟胺A。其中化合物7’-(N-十二烷基亚胺基)井冈羟胺A的脂溶性较母体化合物有了较大的改善。
     在对甲苯磺酸催化下,对井冈羟胺A的C-4,7,4’,7’位羟基进行了缩醛(酮)化反应,合成了29个新的井冈羟胺A-4,7,4’,7’-二缩醛(酮)衍生物。在实验中,对催化剂的用量和反应物的投料比进行了优化,在最优条件下,目标产物收率为32%左右。
     初步建立了针对井冈羟胺A衍生物的分离方法,即将反应产物以水和乙酸乙酯两相分离,低取代产物主要存在于水相,水相浓缩后以醇萃取,醇溶液浓缩后经柱层析二次分离,可得到纯度约80%左右的产物;多取代产物主要存在于酯相,浓缩后可经多次薄板层析或柱层析分离,得到纯度约85%左右的产物。
     对所有井冈羟胺A衍生物均进行了生物活性测定,结果表明,在井冈羟胺A
Validamycins are safe and highly effective bio-pesticides with special modes of action. Validoxylamine A is the aglycone of the validamycin A, which exhibits a very strong competitive inhibitory activity against trehalases. Forty new compounds of validoxylamine A derivatives were prepared based on validoxylamine A as the leading compound. Their bioactivities of insecticidal, fungicidal and herbicidal activity were studied.
    Firstly, validoxylamine A was prepared by hydrolysis of validamycin A through the improved method of synthesis. Calcium carbonate was used as the neutralizing agent and validoxylamine A was crystallized directly from the neutralized solution. The yield of validoxylamine A was 50%. The purity was good. The process of synthesis and the separate method were simple.
    Three new 7'-O-chrysanthemylvalidoxylamine A were prepared in 43.3~44.3% yields by optimizing the reaction time and the molar ratio of reactants. The products were separated by twice column chromatography.
    7'-aldehyde validoxylamine A was prepared by the reaction of selective oxidation. The hydroxyl in the C-7' position of validoxylamine A was oxidated by active manganese dioxide under ultrasonic radiation. It was easy to operate and the yield was 77.8 %
    Seven new 7'-imino-validoxylamine A derivatives were synthesized by the reaction of 7'-aldehyde validoxylamine A and arylamines or alkylamines. 7'-(N-dodecylimino)validoxylamine A , which is better than the leading compound, can dissolve in organic solvent such as ethyl acetate
    In the presence of p-toluenesulphonic acid, twenty-nine of acetals or ketals derivatives of validoxylamine A were prepared from validoxylamine A. The yield was about 32% by optimizing the scalar of catalyzer and the molar ratio of reactants.
    Preliminary method of separating validoxylamine A derivatives was found. The
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